scribblearea.h

/*
 
Pencil2D - Traditional Animation Software
Copyright (C) 2005-2007 Patrick Corrieri & Pascal Naidon
Copyright (C) 2012-2020 Matthew Chiawen Chang
 
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; version 2 of the License.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
*/
 
 
#ifndef SCRIBBLEAREA_H
#define SCRIBBLEAREA_H
 
#include <cstdint>
#include <ctime>
#include <deque>
#include <memory>
 
#include <QColor>
#include <QPoint>
#include <QWidget>
#include <QPixmapCache>
 
#include "movemode.h"
#include "pencildef.h"
#include "bitmapimage.h"
#include "canvaspainter.h"
#include "overlaypainter.h"
#include "preferencemanager.h"
#include "selectionpainter.h"
#include "camerapainter.h"
#include "tiledbuffer.h"
 
class Layer;
class Editor;
class BaseTool;
class PointerEvent;
class BitmapImage;
class VectorImage;
 
 
class ScribbleArea : public QWidget
{
    Q_OBJECT
 
    friend class MoveTool;
    friend class SmudgeTool;
    friend class BucketTool;
 
public:
    ScribbleArea(QWidget* parent);
    ~ScribbleArea() override;
 
    bool init();
    void setEditor(Editor* e) { mEditor = e; }
    Editor* editor() const { return mEditor; }
 
    void deleteSelection();
 
    void applyTransformedSelection();
    void cancelTransformedSelection();
 
    void setEffect(SETTING e, bool isOn);
 
    LayerVisibility getLayerVisibility() const { return mLayerVisibility; }
    qreal getCurveSmoothing() const { return mCurveSmoothingLevel; }
    bool makeInvisible() const { return mMakeInvisible; }
 
    QPointF getCentralPoint();
 
    void updateFrame();
 
    void onScrubbed(int frameNumber);
 
    void onFramesModified();
 
    void onPlayStateChanged();
 
    void onViewChanged();
 
    void onFrameModified(int frameNumber);
 
    void onLayerChanged();
 
    void onSelectionChanged();
 
    void onOnionSkinTypeChanged();
 
    void onObjectLoaded();
 
    void onToolChanged(ToolType);
 
    void endStroke();
 
    void flipSelection(bool flipVertical);
 
    BaseTool* currentTool() const;
 
    bool isMouseInUse() const { return mMouseInUse; }
    bool isTabletInUse() const { return mTabletInUse; }
    bool isPointerInUse() const { return mMouseInUse || mTabletInUse; }
 
    void keyEvent(QKeyEvent* event);
    void keyEventForSelection(QKeyEvent* event);
 
signals:
    void multiLayerOnionSkinChanged(bool);
    void selectionUpdated();
 
    void requestFocus(QWidget* widget);
 
public slots:
    void clearImage();
    void setCurveSmoothing(int);
    void toggleThinLines();
    void increaseLayerVisibilityIndex();
    void decreaseLayerVisibilityIndex();
    void setLayerVisibility(LayerVisibility visibility);
 
    void updateToolCursor();
    void paletteColorChanged(QColor);
 
    void showLayerNotVisibleWarning();
    void onTileUpdated(TiledBuffer* tiledBuffer, Tile* tile);
    void onTileCreated(TiledBuffer* tiledBuffer, Tile* tile);
 
protected:
    bool event(QEvent *event) override;
    void tabletEvent(QTabletEvent*) override;
    void wheelEvent(QWheelEvent*) override;
    void mousePressEvent(QMouseEvent*) override;
    void mouseMoveEvent(QMouseEvent*) override;
    void mouseReleaseEvent(QMouseEvent*) override;
    void mouseDoubleClickEvent(QMouseEvent*) override;
    void keyPressEvent(QKeyEvent*) override;
    void keyReleaseEvent(QKeyEvent*) override;
    void paintEvent(QPaintEvent*) override;
    void resizeEvent(QResizeEvent*) override;
 
public:
    void drawPolyline(QPainterPath path, QPen pen, bool useAA);
    void drawPath(QPainterPath path, QPen pen, QBrush brush, QPainter::CompositionMode cm);
    void drawPen(QPointF thePoint, qreal brushWidth, QColor fillColor, bool useAA = true);
    void drawPencil(QPointF thePoint, qreal brushWidth, qreal fixedBrushFeather, QColor fillColor, qreal opacity);
    void drawBrush(QPointF thePoint, qreal brushWidth, qreal offset, QColor fillColor, QPainter::CompositionMode compMode, qreal opacity, bool usingFeather = true, bool useAA = false);
    void blurBrush(BitmapImage *bmiSource_, QPointF srcPoint_, QPointF thePoint_, qreal brushWidth_, qreal offset_, qreal opacity_);
    void liquifyBrush(BitmapImage *bmiSource_, QPointF srcPoint_, QPointF thePoint_, qreal brushWidth_, qreal offset_, qreal opacity_);
 
    void paintBitmapBuffer();
    void clearDrawingBuffer();
    void setGaussianGradient(QGradient &gradient, QColor color, qreal opacity, qreal offset);
 
    void pointerPressEvent(PointerEvent*);
    void pointerMoveEvent(PointerEvent*);
    void pointerReleaseEvent(PointerEvent*);
 
    void handleDrawingOnEmptyFrame();
 
    TiledBuffer mTiledBuffer;
private:
 
    void invalidatePainterCaches();
 
    void invalidateCacheForFrame(int frameNumber);
 
    void invalidateAllCache();
 
    void invalidateCacheForDirtyFrames();
 
    void invalidateOnionSkinsCacheAround(int frame);
 
    void prepOverlays(int frame);
    void prepCameraPainter(int frame);
    void prepCanvas(int frame);
    void drawCanvas(int frame, QRect rect);
    void settingUpdated(SETTING setting);
    void paintSelectionVisuals(QPainter &painter);
 
    BitmapImage* currentBitmapImage(Layer* layer) const;
    VectorImage* currentVectorImage(Layer* layer) const;
 
    Editor* mEditor = nullptr;
 
    LayerVisibility mLayerVisibility = LayerVisibility::ALL;
    bool mMakeInvisible = false;
    qreal mCurveSmoothingLevel = 0.0;
    int mDeltaFactor = 1;
 
    /* Under certain circumstances a mouse press event will fire after a tablet release event.
       This causes unexpected behaviours for some of the tools, eg. the bucket.
       The problem only seems to occur on windows and only when tapping.
       prior to this fix the event queue would look like this:
       eg: TabletPress -> TabletRelease -> MousePress
       The following will filter mouse events created after a tablet release event.
    */
    void tabletReleaseEventFired();
    bool mMouseInUse = false;
    bool mTabletInUse = false;
    qreal mDevicePixelRatio = 1.;
 
    // Double click handling for tablet input
    void handleDoubleClick();
    bool mIsFirstClick = true;
    int mDoubleClickMillis = 0;
    // Microsoft suggests that a double click action should be no more than 500 ms
    const int DOUBLE_CLICK_THRESHOLD = 500;
    QTimer* mDoubleClickTimer = nullptr;
    QPointF mTabletPressPos;
    int mTabletReleaseMillisAgo;
    const int MOUSE_FILTER_THRESHOLD = 200;
    bool mTabletHasEntered = false;
 
    QTimer* mMouseFilterTimer = nullptr;
 
    PreferenceManager* mPrefs = nullptr;
 
    QPixmap mCanvas;
    CanvasPainter mCanvasPainter;
    OverlayPainter mOverlayPainter;
    SelectionPainter mSelectionPainter;
    CameraPainter mCameraPainter;
 
    QPolygonF mOriginalPolygonF = QPolygonF();
 
    // Pixmap Cache keys
    QMap<unsigned int, QPixmapCache::Key> mPixmapCacheKeys;
 
    // debug
    QLoggingCategory mLog{ "ScribbleArea" };
};
 
#endif